Phase compensating apparatus and delay controlling circuit
First Claim
1. A phase compensating apparatus comprising:
- phase difference compensation signal outputting means for outputting a signal, obtained by delaying an external clock signal based on digital delay time data, for compensating for a phase difference between the external clock signal and an internal clock signal;
a structural element for receiving the signal outputted from said phase difference compensation signal outputting means and outputting the internal clock signal; and
delay time detecting means for receiving the signal outputted from the phase difference compensation signal outputting means and the internal clock signal and detecting a difference between a delay caused by the structual element and a cycle of the external clock signal based on the received signals, and outputting the detected difference as digital delay time data to said phase difference compensation signal outputting means.
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Abstract
A delay/digital converting circuit in a phase compensating apparatus detects a time period after a measurement start signal that is an internal clock signal is input, until a measurement end signal that is an output signal of a digital/delay converting circuit is input, and outputs the resultant data as digital data to a digital/delay converting circuit. The delay/digital converting circuit outputs the difference between the cycle of an external clock signal and an amount of delay time of a clock distributing circuit as the digital data. The digital/delay converting circuit delays the external clock signal according to the digital data. An internal clock signal which is the output signal of the digital/delay converting circuit that has been delayed by the clock distributing circuit is a signal that has a delay for one cycle of the external clock signal. Thus, the phase of the external clock signal accords with the phase of the internal clock signal.
49 Citations
25 Claims
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1. A phase compensating apparatus comprising:
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phase difference compensation signal outputting means for outputting a signal, obtained by delaying an external clock signal based on digital delay time data, for compensating for a phase difference between the external clock signal and an internal clock signal; a structural element for receiving the signal outputted from said phase difference compensation signal outputting means and outputting the internal clock signal; and delay time detecting means for receiving the signal outputted from the phase difference compensation signal outputting means and the internal clock signal and detecting a difference between a delay caused by the structual element and a cycle of the external clock signal based on the received signals, and outputting the detected difference as digital delay time data to said phase difference compensation signal outputting means. - View Dependent Claims (2)
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3. A phase compensating apparatus comprising:
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delay time detecting means for subtracting a delay time period of an internal signal having a delay, with respect to an input signal, from the cycle of the input signal and outputting the result as digital delay time data; phase difference compensation signal outputting means for delaying the input signal corresponding to the digital delay time data so as to compensate for the phase difference between the input signal and the internal signal to produce a first output signal; delaying means for delaying the first output signal corresponding to a setting value which becomes a desired delay to produce a second output signal; and waveform generating means for generating a resultant signal corresponding to the first output signal and the second output signal and outputting the resultant signal. - View Dependent Claims (4, 5)
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6. A phase compensating apparatus comprising:
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first delay/digital converting means for outputting digital delay time data having a value corresponding to a time period measured from when a signal level of a second signal, having a delay with respect to a first signal, becomes "H" or "L" until a signal level of the first signal becomes "H" or "L"; first digital/delay converting means for outputting the first signal corresponding to an input signal delayed according to the digital delay time data; a cycle detecting circuit for detecting the cycle of the input signal; a calculating circuit for calculating an "H" level period or "L" level period of a signal that has a cycle detected by said cycle detecting circuit and that has a desired duty ratio; second digital/delay converting means for outputting a third signal corresponding to the first signal delayed for a time period corresponding to the "H" or "L" level calculated by said calculating circuit; and a waveform generating circuit for generating a signal whose signal level varies as the signal level of the first signal or the signal level of the third signal becomes "H" or "L". - View Dependent Claims (7, 8, 9)
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10. A phase compensating apparatus comprising:
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first delay/digital converting means for outputting digital delay time data having a value corresponding to a time period measured from when a signal level of a second signal, having a delay with respect to a first signal, becomes "H" or "L" until a signal level of the first signal becomes "H" or "L"; first digital/delay converting means for outputting the first signal corresponding to an input signal delayed according to the digital delay time data; a cycle detecting circuit for detecting the cycle of the input signal; a first calculating circuit for calculating a delay amount for the first signal; second digital/delay converting means for delaying the first signal based on the delay amount calculated by said first calculating circuit; a second calculating circuit for calculating an "H" level period or an "L" level period of a signal that has a cycle detected by said cycle detecting circuit and that has a desired duty ratio; an OR circuit for ORing output from said first signal digital/delay converting means and an output signal of said second digital/delay converting circuit; third digital/delay converting means for delaying an output signal of said OR circuit based on the "H" or "L" level period; and a waveform generating circuit for generating a signal whose signal level varies as the signal levels of the output signals of said OR circuit and said third digital/delay converting means becomes "H" or "L". - View Dependent Claims (11, 12)
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13. A phase compensating apparatus comprising:
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first delay/digital converting means for outputting digital delay time data having a value corresponding to a time period measured from when a signal level of a second signal, having a delay with respect to a first signal, becomes "H" or "L" until a signal level of the first signal becomes "H" or "L"; first digital/delay converting means for outputting the first signal corresponding to an input signal delayed according to the digital delay time data; a cycle detecting circuit for detecting the cycle of the input signal; a first calculating circuit for calculating a delay amount for the first signal; second digital/delay converting means for delaying the first signal by the calculated delay amount for the first signal; a second calculating circuit for calculating an "H" level period or "L" level period of a signal that has a cycle detected by said cycle detecting circuit and that has a desired duty ratio; third digital/delay converting means for delaying an output signal of said second digital/delay converting means by the "H" or "L" level period; and a waveform generating circuit for generating a signal whose signal level varies as the signal levels of output signals of said second digital/delay converting means and said third digital/delay converting means becomes "H" or "L". - View Dependent Claims (14, 15, 16)
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17. A delay controlling circuit, comprising:
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delay/digital converting means for outputting digital delay time data indicating a delay by a structural element in a subsequent stage between a measurement start signal and a measurement end signal; and digital/delay converting means for delaying an input signal based on the digital delay time data to produce a resultant signal, and outputting the resultant signal to the structural element in the subsequent stage. - View Dependent Claims (18)
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19. A delay controlling circuit, comprising:
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a delay/digital converting circuit for outputting delay time data corresponding to a delay by a structural element in a subsequent stage between a measurement start signal and a measurement end signal; calculating means for performing a predetermined calculation on the delay time data; and digital/delay converting means for outputting to the structural element in the subsequent stage a signal based on the input signal delayed by an amount indicated by said calculating means. - View Dependent Claims (20)
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21. A phase compensating apparatus comprising:
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a phase difference compensation signal outputting circuit for outputting a signal, obtained by delaying an external clock signal based on digital delay time data, for compensating for a phase difference between the external clock signal and an internal clock signal; a structural element for receiving the signal outputted from said phase difference compensation signal outputting circuit and outputting the internal clock signal; and a delay time detecting circuit for receiving the signal outputted from said phase difference compensation signal outputting circuit and the internal clock signal and detecting a difference between a delay caused by the internal structural element and a cycle of the external clock signal based on the received signals, and outputting the detected difference as the digital delay time data to said phase difference compensation outputting circuit.
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22. A phase compensating apparatus for compensating for a phase difference between an input signal having a cycle and an internal signal, the phase compensating apparatus comprising:
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a first delay/digital converting circuit for subtracting a delay time period introduced by a structural element in a subsequent stage between the input signal and a second signal from the cycle of the input signal to produce digital delay time data; and a first digital/delay converting circuit for delaying the input signal based on the digital delay time data and outputting a resultant signal to the structural element in the subsequent stage.
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23. A phase compensating method for compensating for a phase difference between an input signal having a cycle and an internal signal, the method comprising the steps of:
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subtracting a delay time period introduced by a structural element in a subsequent stage between the internal signal and the input signal, from a cycle of the input signal to produce digital delay time data; and delaying the input signal based on the digital delay time data to compensate for a phase difference between the input signal and the internal signal and outputting the delayed input signal to the structural element in the subsequent stage.
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24. A phase compensating method, comprising the steps of:
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outputting a value corresponding to a time period introduced by a structural element in a subsequent stage after a signal level of a second signal becomes "H" or "L" until the signal level of a first signal becomes "H" or "L" as digital delay time data; and outputting a signal which is an input signal that has been delayed according to the digital delay time as the first signal to the structural element in the subsequent stage.
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25. A delay controlling method, comprising the steps of:
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outputting a delay introduced by a structural element in a subsequent stage between a measurement start signal and a measurement end signal as digital delay time data; and delaying an input signal for the digital delay time data and outputting a resultant signal to the structural element in the subsequent stage.
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Specification